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(No Model.)

J. T. ROBB. EXTENSION ELEGTROLIER.

No. 337199. Patented Mar. 2, 1886.

N. PETERS. Phowufllcgnphnr. Washinginn D.C.

mm) TATES JAMES T. ROBB, OF NEW YORK, N. Y.

EXT'ENSION-ELECTROLIER.

SPECIFICATION forming part of Letters Patent No. 337,199. dated March 2, 1886.

Application filed September 26, 1885. Serial Nu. 178,317. X0 model.)

To all whom it may concern.-

Be it known that I, JAMES T. Roles, of New York, in the county and State of New York, have invented a certain new and useful Improvement in Extension-Electroliers, of which the following is a specification.

The object of this invention is to provide a fixture for supporting one or more electric lamps in which the position of the lamp can be raised or lowered, the lamp being .thus placed at any desired elevation; and'the invention consists in the novel devices and combinations of devices employed by me in accomplishing this object, as hereinafter set forth and claimed.

My invention is illustrated in the annexed drawings, in which Figure l is a view in elevation of a fixture embodying said invention; Fig. 2, an enlarged vertical section of the upper portion of the same; Fig. 3, a similar view of the lower portion of the fixture. Figs. 4 and 5 are detail views of parts of the fixture, and Fig. 6 is an end View of the sliding tube.

A is the main supporting-stem of the fixture containing the insulated conducting-wiresa a and inclosed by the shell or casing b. Stem A at its lower end is screwed into a collar, 0, on the upper side of ring (1. The external casing, b,enters the upper end of the two-part shell B B, the parts of which fit together at e, and the upper half, B, of the shell is held against b by one or more set-screws, f. At the lower side of the shell or chamber B B the tube 0 is screwed into the collar gof ring (2. Part B of the shell surrounds the collar 9, and is held in position by a nut, h, on tube 0, which is screwed up against the bottom of the shell.

Within the tube G is the square sliding tube D, which has a ring or collar, 2', at its upper end,to guide it in O. The square tube D extends continuously down to the lamp-socket E, which it supports, and which carries the incandescing electric lamp F.

The frictional device for holding the sliding tube in the desired position may be any one of those used in extension gas fixtures. That shown is constructed as follows: To thelower end of tube 0 is attached a metalbox, G, having curved sides. Within the box, held by projections k k, are two curved spring-pieces, Z Z. The tube 0 slides between friction-blocks m m, shaped as shown, and between each block m and a spring, Z, is a roller, n. The frictionsurfaces of the blocks arecovered with felt or rubber. Screw-holes 0 0 are shown, by which the cover of the box (not shown) is screwed on. The box 0 is inclosed by the two-part shell H H. At the lower end of the box is the internally and externally screw-threaded collarp, upon which the nut r is screwed to hold the shell. A ring, 8, is provided for the same purpose at the top of the shell.

The externally screw-threaded sleevetscrews up through the collarp, and its positionis adjusted relative to the blocks in m, to regulate the friction.

The conductors a a, which preferably are stiff or rigid wires, extend to the top of the chamber formed by the shell B B, and are there connected with the two insulated conductors of the flexible conducting cord I. This cord is of suitable length to permit the movement of the sliding tube D, and its other end is secured within the end of said tube to two rigid insulated wires, .4 a, which extend the whole length of the tube D, and are connected within the socket to the terminals thereof in the usual manner.

XVhen the lamp is to belowered,the tube D is drawn down and the flexible cord is drawn into the tube 0. The friction-blocks are forced in by their springs and rollers against tube D, so that said tube is drawn down against this frictional pressure,and is held thereby at any desired point. Y

To raise thelainp, tubeDis pushed up again, whereupon the flexible cord is pushed back into the chamber B B and coilsitself up within such chamber. The friction -blocks do not press upon the tube in its upward movement, but as soon as this ceases at any point the first slight downward movement causes the blocks to grip the tube and hold it where it is placed.

The sliding tube may evidently carry two or more lamps upon branching arms, if desired.

The fixture described is one very simple in its construction and operation, and by the use of the flexible cord does away with the objectionable sliding contacts, which have heretofore been employed in extension-electroliers.

What I claim is- 1. In an electric-light fixture, the combination of a stationary tube or body, a tube slid ring, the sliding tube within said stationary :5 tube carryinga lamp and inclosing electrical conductors, and flexible conductors connected electrically with said inclosed conductors and adapted to be placed in or withdrawn from the said shell as the sliding tube is raised or low- 20 'ered, substantially as set forth.

This specification signed and witnessed this 24th day of July, 1885.

JAMES T. ROBB.

Witnesses:

P. H. KLEIN, Jr., JNo. F. GEIDEL. 

